Al I can think of is if the switch matrix I/O is damaged on the board,
then it could go directly to SELF-TEST...and unplugging the switch
inputs wouldn't change that.
Diode Test the Switch Returns to see if any gates are blown.
John :-#)#
On 2024-12-13 6:48 a.m., Kerry Imming wrote:
I am trying to help with a problem with an Operation Thunder (1992).
Pressing the TEST button should allow you to select SELF-TEST,
BOOKKEEPING, or ADJUSTMENTS. Instead, the game skips directly in to
test mode.
Isolating/disconnecting the switch matrix did not help so I'm pretty
sure it's not another game switch causing issues.
According to PinWiki, access to settings may be blocked by a
"tournament board", but that only applies to later System 3 games.
Any ideas on how to troubleshoot this?
- Kerry
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